diff --git a/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/mp4/Mp4Extractor.java b/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/mp4/Mp4Extractor.java
index 9bf29fc22a..d542fa8545 100644
--- a/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/mp4/Mp4Extractor.java
+++ b/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/mp4/Mp4Extractor.java
@@ -133,7 +133,7 @@ public final class Mp4Extractor implements Extractor, SeekMap {
    */
   private static final long MAXIMUM_READ_AHEAD_BYTES_STREAM = 10 * 1024 * 1024;
 
-  private final @Flags int flags;
+  @Flags private final int flags;
 
   // Temporary arrays.
   private final ParsableByteArray nalStartCode;